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Oracle 1z0-830 Exam Syllabus Topics:
| Section | Objectives |
|---|---|
| Topic 1: Object-Oriented Programming | - Create and use classes, interfaces, enums, and records - Implement encapsulation and abstraction - Apply inheritance and polymorphism |
| Topic 2: Exception Handling | - Handle checked and unchecked exceptions - Create custom exceptions - Use try-with-resources |
| Topic 3: Java I/O and NIO | - Use Path, Files, and related APIs - Process file system resources - Read and write files |
| Topic 4: Controlling Program Flow | - Work with records and sealed classes - Apply decision statements and loops - Use switch expressions and pattern matching |
| Topic 5: Functional Programming | - Process data using Stream API - Use lambda expressions and method references - Work with functional interfaces |
| Topic 6: Modules and Packaging | - Create and use Java modules - Manage dependencies and exports - Package and deploy applications |
| Topic 7: Java Concurrency | - Work with concurrent collections and executors - Create and manage threads - Use virtual threads |
| Topic 8: Collections and Generics | - Use sequenced collections and maps - Use List, Set, Map, Queue, and Deque implementations - Apply generics and bounded types |
| Topic 9: Annotations and JDBC | - Use built-in and custom annotations - Connect to databases using JDBC - Execute SQL operations and process results |
| Topic 10: Handling Date, Time, Text, Numeric and Boolean Values | - Use String, StringBuilder, and related APIs - Use date, time, duration, period, and localization APIs - Work with primitive wrappers and number formatting |
Oracle Java SE 21 Developer Professional Sample Questions:
Which of the following can be the body of a lambda expression?
- A. None of the above
- B. A statement block
- C. An expression and a statement
- D. Two statements
- E. Two expressions
Correct Answer: B 🗳️
Explanation: Only visible for ValidVCE members. You can sign-up / login (it's free).
What do the following print?
java
public class DefaultAndStaticMethods {
public static void main(String[] args) {
WithStaticMethod.print();
}
}
interface WithDefaultMethod {
default void print() {
System.out.print("default");
}
}
interface WithStaticMethod extends WithDefaultMethod {
static void print() {
System.out.print("static");
}
}
- A. nothing
- B. static
- C. Compilation fails
- D. default
Correct Answer: B 🗳️
Explanation: Only visible for ValidVCE members. You can sign-up / login (it's free).
What does the following code print?
java
import java.util.stream.Stream;
public class StreamReduce {
public static void main(String[] args) {
Stream<String> stream = Stream.of("J", "a", "v", "a");
System.out.print(stream.reduce(String::concat));
}
}
- A. null
- B. Optional[Java]
- C. Compilation fails
- D. Java
Correct Answer: B 🗳️
Explanation: Only visible for ValidVCE members. You can sign-up / login (it's free).
Given:
java
var array1 = new String[]{ "foo", "bar", "buz" };
var array2[] = { "foo", "bar", "buz" };
var array3 = new String[3] { "foo", "bar", "buz" };
var array4 = { "foo", "bar", "buz" };
String array5[] = new String[]{ "foo", "bar", "buz" };
Which arrays compile? (Select 2)
- A. array4
- B. array1
- C. array2
- D. array5
- E. array3
Correct Answer: B,D 🗳️
Explanation: Only visible for ValidVCE members. You can sign-up / login (it's free).
Given:
java
var now = LocalDate.now();
var format1 = new DateTimeFormatter(ISO_WEEK_DATE);
var format2 = DateTimeFormatter.ISO_WEEK_DATE;
var format3 = new DateFormat(WEEK_OF_YEAR_FIELD);
var format4 = DateFormat.getDateInstance(WEEK_OF_YEAR_FIELD);
System.out.println(now.format(REPLACE_HERE));
Which variable prints 2025-W01-2 (present-day is 12/31/2024)?
- A. format2
- B. format1
- C. format3
- D. format4
Correct Answer: A 🗳️
Explanation: Only visible for ValidVCE members. You can sign-up / login (it's free).
Suzanne 
Barlow 
Renee 
Dunn 
Paddy 
Quentin 
Warner 
Bella 
Baird 
Geoffrey 
Aries 
Marshall 
Steward 
Colby 
Megan 
Grace 
Burnell 
